fix(core): don't ship an Ivy compiled library (#5915)

Shipping as Ivy compiled is not recommended by Angular it it breaks
every library that has a dependency on ngx-bootstrap and that does
not ship as Ivy  compiled.

Enabling "fullTemplateTypeCheck" also works around an Angular compiler
problem regarding the `forRoot()` not working..

See #5862

scripts/ng-packagr/tsconfig.ngc.json

@@ -1,9 +1,11 @@
 {
   "angularCompilerOptions": {
+    "enableIvy": false,
+    "disableExpressionLowering": true,
     "annotateForClosureCompiler": true,
     "skipTemplateCodegen": true,
     "strictMetadataEmit": true,
-    "fullTemplateTypeCheck": false,
+    "fullTemplateTypeCheck": true,
     "enableResourceInlining": true
   },
   "buildOnSave": false,